Absolute pressure sensor
US7380459B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 2007 |
| Grant date | Jun 3, 2008 |
| Priority date | — |
| Expiry date | Jan 16, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/0022
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An absolute pressure sensor is provided comprising a vibration sensing element such as a piezoelectric element disposed on a vibratable seal. The seal is disposed between two gas spring chambers which are maintained at substantially ambient pressure. The resonant vibration frequency of the seal changes and is proportional with the pressure in the gas spring chambers such that the electrical output of the piezoelectric element will be proportional to the vibration frequency. The frequency of the output of the piezoelectric element is read using suitable electronic circuitry and compared to a set of predetermined pressure/frequency data for calculation of a pressure value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.